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Initial commit
[wrt350n-kernel.git] / drivers / net / wan / pc300too.c
blobbf1b01590429d00ee45f3947c632726c4078b4de
1 /*
2 * Cyclades PC300 synchronous serial card driver for Linux
3 *
4 * Copyright (C) 2000-2007 Krzysztof Halasa <khc@pm.waw.pl>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
9 *
10 * For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>.
11 *
12 * Sources of information:
13 * Hitachi HD64572 SCA-II User's Manual
14 * Cyclades PC300 Linux driver
15 *
16 * This driver currently supports only PC300/RSV (V.24/V.35) and
17 * PC300/X21 cards.
18 */
19
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/sched.h>
24 #include <linux/types.h>
25 #include <linux/fcntl.h>
26 #include <linux/in.h>
27 #include <linux/string.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/ioport.h>
31 #include <linux/moduleparam.h>
32 #include <linux/netdevice.h>
33 #include <linux/hdlc.h>
34 #include <linux/pci.h>
35 #include <linux/delay.h>
36 #include <asm/io.h>
37
38 #include "hd64572.h"
39
40 static const char* version = "Cyclades PC300 driver version: 1.17";
41 static const char* devname = "PC300";
42
43 #undef DEBUG_PKT
44 #define DEBUG_RINGS
45
46 #define PC300_PLX_SIZE 0x80 /* PLX control window size (128 B) */
47 #define PC300_SCA_SIZE 0x400 /* SCA window size (1 KB) */
48 #define ALL_PAGES_ALWAYS_MAPPED
49 #define NEED_DETECT_RAM
50 #define NEED_SCA_MSCI_INTR
51 #define MAX_TX_BUFFERS 10
52
53 static int pci_clock_freq = 33000000;
54 static int use_crystal_clock = 0;
55 static unsigned int CLOCK_BASE;
56
57 /* Masks to access the init_ctrl PLX register */
58 #define PC300_CLKSEL_MASK (0x00000004UL)
59 #define PC300_CHMEDIA_MASK(port) (0x00000020UL << ((port) * 3))
60 #define PC300_CTYPE_MASK (0x00000800UL)
61
62
63 enum { PC300_RSV = 1, PC300_X21, PC300_TE }; /* card types */
64
65 /*
66 * PLX PCI9050-1 local configuration and shared runtime registers.
67 * This structure can be used to access 9050 registers (memory mapped).
68 */
69 typedef struct {
70 u32 loc_addr_range[4]; /* 00-0Ch : Local Address Ranges */
71 u32 loc_rom_range; /* 10h : Local ROM Range */
72 u32 loc_addr_base[4]; /* 14-20h : Local Address Base Addrs */
73 u32 loc_rom_base; /* 24h : Local ROM Base */
74 u32 loc_bus_descr[4]; /* 28-34h : Local Bus Descriptors */
75 u32 rom_bus_descr; /* 38h : ROM Bus Descriptor */
76 u32 cs_base[4]; /* 3C-48h : Chip Select Base Addrs */
77 u32 intr_ctrl_stat; /* 4Ch : Interrupt Control/Status */
78 u32 init_ctrl; /* 50h : EEPROM ctrl, Init Ctrl, etc */
79 }plx9050;
80
81
82
83 typedef struct port_s {
84 struct net_device *dev;
85 struct card_s *card;
86 spinlock_t lock; /* TX lock */
87 sync_serial_settings settings;
88 int rxpart; /* partial frame received, next frame invalid*/
89 unsigned short encoding;
90 unsigned short parity;
91 unsigned int iface;
92 u16 rxin; /* rx ring buffer 'in' pointer */
93 u16 txin; /* tx ring buffer 'in' and 'last' pointers */
94 u16 txlast;
95 u8 rxs, txs, tmc; /* SCA registers */
96 u8 phy_node; /* physical port # - 0 or 1 */
97 }port_t;
98
99
100
101 typedef struct card_s {
102 int type; /* RSV, X21, etc. */
103 int n_ports; /* 1 or 2 ports */
104 u8 __iomem *rambase; /* buffer memory base (virtual) */
105 u8 __iomem *scabase; /* SCA memory base (virtual) */
106 plx9050 __iomem *plxbase; /* PLX registers memory base (virtual) */
107 u32 init_ctrl_value; /* Saved value - 9050 bug workaround */
108 u16 rx_ring_buffers; /* number of buffers in a ring */
109 u16 tx_ring_buffers;
110 u16 buff_offset; /* offset of first buffer of first channel */
111 u8 irq; /* interrupt request level */
112
113 port_t ports[2];
114 }card_t;
115
116
117 #define sca_in(reg, card) readb(card->scabase + (reg))
118 #define sca_out(value, reg, card) writeb(value, card->scabase + (reg))
119 #define sca_inw(reg, card) readw(card->scabase + (reg))
120 #define sca_outw(value, reg, card) writew(value, card->scabase + (reg))
121 #define sca_inl(reg, card) readl(card->scabase + (reg))
122 #define sca_outl(value, reg, card) writel(value, card->scabase + (reg))
123
124 #define port_to_card(port) (port->card)
125 #define log_node(port) (port->phy_node)
126 #define phy_node(port) (port->phy_node)
127 #define winbase(card) (card->rambase)
128 #define get_port(card, port) ((port) < (card)->n_ports ? \
129 (&(card)->ports[port]) : (NULL))
130
131 #include "hd6457x.c"
132
133
134 static void pc300_set_iface(port_t *port)
135 {
136 card_t *card = port->card;
137 u32 __iomem * init_ctrl = &card->plxbase->init_ctrl;
138 u16 msci = get_msci(port);
139 u8 rxs = port->rxs & CLK_BRG_MASK;
140 u8 txs = port->txs & CLK_BRG_MASK;
141
142 sca_out(EXS_TES1, (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
143 port_to_card(port));
144 switch(port->settings.clock_type) {
145 case CLOCK_INT:
146 rxs |= CLK_BRG; /* BRG output */
147 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
148 break;
149
150 case CLOCK_TXINT:
151 rxs |= CLK_LINE; /* RXC input */
152 txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */
153 break;
154
155 case CLOCK_TXFROMRX:
156 rxs |= CLK_LINE; /* RXC input */
157 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
158 break;
159
160 default: /* EXTernal clock */
161 rxs |= CLK_LINE; /* RXC input */
162 txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */
163 break;
164 }
165
166 port->rxs = rxs;
167 port->txs = txs;
168 sca_out(rxs, msci + RXS, card);
169 sca_out(txs, msci + TXS, card);
170 sca_set_port(port);
171
172 if (port->card->type == PC300_RSV) {
173 if (port->iface == IF_IFACE_V35)
174 writel(card->init_ctrl_value |
175 PC300_CHMEDIA_MASK(port->phy_node), init_ctrl);
176 else
177 writel(card->init_ctrl_value &
178 ~PC300_CHMEDIA_MASK(port->phy_node), init_ctrl);
179 }
180 }
181
182
183
184 static int pc300_open(struct net_device *dev)
185 {
186 port_t *port = dev_to_port(dev);
187
188 int result = hdlc_open(dev);
189 if (result)
190 return result;
191
192 sca_open(dev);
193 pc300_set_iface(port);
194 return 0;
195 }
196
197
198
199 static int pc300_close(struct net_device *dev)
200 {
201 sca_close(dev);
202 hdlc_close(dev);
203 return 0;
204 }
205
206
207
208 static int pc300_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
209 {
210 const size_t size = sizeof(sync_serial_settings);
211 sync_serial_settings new_line;
212 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
213 int new_type;
214 port_t *port = dev_to_port(dev);
215
216 #ifdef DEBUG_RINGS
217 if (cmd == SIOCDEVPRIVATE) {
218 sca_dump_rings(dev);
219 return 0;
220 }
221 #endif
222 if (cmd != SIOCWANDEV)
223 return hdlc_ioctl(dev, ifr, cmd);
224
225 if (ifr->ifr_settings.type == IF_GET_IFACE) {
226 ifr->ifr_settings.type = port->iface;
227 if (ifr->ifr_settings.size < size) {
228 ifr->ifr_settings.size = size; /* data size wanted */
229 return -ENOBUFS;
230 }
231 if (copy_to_user(line, &port->settings, size))
232 return -EFAULT;
233 return 0;
234
235 }
236
237 if (port->card->type == PC300_X21 &&
238 (ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
239 ifr->ifr_settings.type == IF_IFACE_X21))
240 new_type = IF_IFACE_X21;
241
242 else if (port->card->type == PC300_RSV &&
243 (ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL ||
244 ifr->ifr_settings.type == IF_IFACE_V35))
245 new_type = IF_IFACE_V35;
246
247 else if (port->card->type == PC300_RSV &&
248 ifr->ifr_settings.type == IF_IFACE_V24)
249 new_type = IF_IFACE_V24;
250
251 else
252 return hdlc_ioctl(dev, ifr, cmd);
253
254 if (!capable(CAP_NET_ADMIN))
255 return -EPERM;
256
257 if (copy_from_user(&new_line, line, size))
258 return -EFAULT;
259
260 if (new_line.clock_type != CLOCK_EXT &&
261 new_line.clock_type != CLOCK_TXFROMRX &&
262 new_line.clock_type != CLOCK_INT &&
263 new_line.clock_type != CLOCK_TXINT)
264 return -EINVAL; /* No such clock setting */
265
266 if (new_line.loopback != 0 && new_line.loopback != 1)
267 return -EINVAL;
268
269 memcpy(&port->settings, &new_line, size); /* Update settings */
270 port->iface = new_type;
271 pc300_set_iface(port);
272 return 0;
273 }
274
275
276
277 static void pc300_pci_remove_one(struct pci_dev *pdev)
278 {
279 int i;
280 card_t *card = pci_get_drvdata(pdev);
281
282 for (i = 0; i < 2; i++)
283 if (card->ports[i].card) {
284 struct net_device *dev = port_to_dev(&card->ports[i]);
285 unregister_hdlc_device(dev);
286 }
287
288 if (card->irq)
289 free_irq(card->irq, card);
290
291 if (card->rambase)
292 iounmap(card->rambase);
293 if (card->scabase)
294 iounmap(card->scabase);
295 if (card->plxbase)
296 iounmap(card->plxbase);
297
298 pci_release_regions(pdev);
299 pci_disable_device(pdev);
300 pci_set_drvdata(pdev, NULL);
301 if (card->ports[0].dev)
302 free_netdev(card->ports[0].dev);
303 if (card->ports[1].dev)
304 free_netdev(card->ports[1].dev);
305 kfree(card);
306 }
307
308
309
310 static int __devinit pc300_pci_init_one(struct pci_dev *pdev,
311 const struct pci_device_id *ent)
312 {
313 card_t *card;
314 u32 __iomem *p;
315 int i;
316 u32 ramsize;
317 u32 ramphys; /* buffer memory base */
318 u32 scaphys; /* SCA memory base */
319 u32 plxphys; /* PLX registers memory base */
320
321 #ifndef MODULE
322 static int printed_version;
323 if (!printed_version++)
324 printk(KERN_INFO "%s\n", version);
325 #endif
326
327 i = pci_enable_device(pdev);
328 if (i)
329 return i;
330
331 i = pci_request_regions(pdev, "PC300");
332 if (i) {
333 pci_disable_device(pdev);
334 return i;
335 }
336
337 card = kzalloc(sizeof(card_t), GFP_KERNEL);
338 if (card == NULL) {
339 printk(KERN_ERR "pc300: unable to allocate memory\n");
340 pci_release_regions(pdev);
341 pci_disable_device(pdev);
342 return -ENOBUFS;
343 }
344 pci_set_drvdata(pdev, card);
345
346 if (pdev->device == PCI_DEVICE_ID_PC300_TE_1 ||
347 pdev->device == PCI_DEVICE_ID_PC300_TE_2)
348 card->type = PC300_TE; /* not fully supported */
349 else if (card->init_ctrl_value & PC300_CTYPE_MASK)
350 card->type = PC300_X21;
351 else
352 card->type = PC300_RSV;
353
354 if (pdev->device == PCI_DEVICE_ID_PC300_RX_1 ||
355 pdev->device == PCI_DEVICE_ID_PC300_TE_1)
356 card->n_ports = 1;
357 else
358 card->n_ports = 2;
359
360 for (i = 0; i < card->n_ports; i++)
361 if (!(card->ports[i].dev = alloc_hdlcdev(&card->ports[i]))) {
362 printk(KERN_ERR "pc300: unable to allocate memory\n");
363 pc300_pci_remove_one(pdev);
364 return -ENOMEM;
365 }
366
367 if (pci_resource_len(pdev, 0) != PC300_PLX_SIZE ||
368 pci_resource_len(pdev, 2) != PC300_SCA_SIZE ||
369 pci_resource_len(pdev, 3) < 16384) {
370 printk(KERN_ERR "pc300: invalid card EEPROM parameters\n");
371 pc300_pci_remove_one(pdev);
372 return -EFAULT;
373 }
374
375 plxphys = pci_resource_start(pdev,0) & PCI_BASE_ADDRESS_MEM_MASK;
376 card->plxbase = ioremap(plxphys, PC300_PLX_SIZE);
377
378 scaphys = pci_resource_start(pdev,2) & PCI_BASE_ADDRESS_MEM_MASK;
379 card->scabase = ioremap(scaphys, PC300_SCA_SIZE);
380
381 ramphys = pci_resource_start(pdev,3) & PCI_BASE_ADDRESS_MEM_MASK;
382 card->rambase = ioremap(ramphys, pci_resource_len(pdev,3));
383
384 if (card->plxbase == NULL ||
385 card->scabase == NULL ||
386 card->rambase == NULL) {
387 printk(KERN_ERR "pc300: ioremap() failed\n");
388 pc300_pci_remove_one(pdev);
389 }
390
391 /* PLX PCI 9050 workaround for local configuration register read bug */
392 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, scaphys);
393 card->init_ctrl_value = readl(&((plx9050 __iomem *)card->scabase)->init_ctrl);
394 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, plxphys);
395
396 /* Reset PLX */
397 p = &card->plxbase->init_ctrl;
398 writel(card->init_ctrl_value | 0x40000000, p);
399 readl(p); /* Flush the write - do not use sca_flush */
400 udelay(1);
401
402 writel(card->init_ctrl_value, p);
403 readl(p); /* Flush the write - do not use sca_flush */
404 udelay(1);
405
406 /* Reload Config. Registers from EEPROM */
407 writel(card->init_ctrl_value | 0x20000000, p);
408 readl(p); /* Flush the write - do not use sca_flush */
409 udelay(1);
410
411 writel(card->init_ctrl_value, p);
412 readl(p); /* Flush the write - do not use sca_flush */
413 udelay(1);
414
415 ramsize = sca_detect_ram(card, card->rambase,
416 pci_resource_len(pdev, 3));
417
418 if (use_crystal_clock)
419 card->init_ctrl_value &= ~PC300_CLKSEL_MASK;
420 else
421 card->init_ctrl_value |= PC300_CLKSEL_MASK;
422
423 writel(card->init_ctrl_value, &card->plxbase->init_ctrl);
424 /* number of TX + RX buffers for one port */
425 i = ramsize / (card->n_ports * (sizeof(pkt_desc) + HDLC_MAX_MRU));
426 card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
427 card->rx_ring_buffers = i - card->tx_ring_buffers;
428
429 card->buff_offset = card->n_ports * sizeof(pkt_desc) *
430 (card->tx_ring_buffers + card->rx_ring_buffers);
431
432 printk(KERN_INFO "pc300: PC300/%s, %u KB RAM at 0x%x, IRQ%u, "
433 "using %u TX + %u RX packets rings\n",
434 card->type == PC300_X21 ? "X21" :
435 card->type == PC300_TE ? "TE" : "RSV",
436 ramsize / 1024, ramphys, pdev->irq,
437 card->tx_ring_buffers, card->rx_ring_buffers);
438
439 if (card->tx_ring_buffers < 1) {
440 printk(KERN_ERR "pc300: RAM test failed\n");
441 pc300_pci_remove_one(pdev);
442 return -EFAULT;
443 }
444
445 /* Enable interrupts on the PCI bridge, LINTi1 active low */
446 writew(0x0041, &card->plxbase->intr_ctrl_stat);
447
448 /* Allocate IRQ */
449 if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, devname, card)) {
450 printk(KERN_WARNING "pc300: could not allocate IRQ%d.\n",
451 pdev->irq);
452 pc300_pci_remove_one(pdev);
453 return -EBUSY;
454 }
455 card->irq = pdev->irq;
456
457 sca_init(card, 0);
458
459 // COTE not set - allows better TX DMA settings
460 // sca_out(sca_in(PCR, card) | PCR_COTE, PCR, card);
461
462 sca_out(0x10, BTCR, card);
463
464 for (i = 0; i < card->n_ports; i++) {
465 port_t *port = &card->ports[i];
466 struct net_device *dev = port_to_dev(port);
467 hdlc_device *hdlc = dev_to_hdlc(dev);
468 port->phy_node = i;
469
470 spin_lock_init(&port->lock);
471 dev->irq = card->irq;
472 dev->mem_start = ramphys;
473 dev->mem_end = ramphys + ramsize - 1;
474 dev->tx_queue_len = 50;
475 dev->do_ioctl = pc300_ioctl;
476 dev->open = pc300_open;
477 dev->stop = pc300_close;
478 hdlc->attach = sca_attach;
479 hdlc->xmit = sca_xmit;
480 port->settings.clock_type = CLOCK_EXT;
481 port->card = card;
482 if (card->type == PC300_X21)
483 port->iface = IF_IFACE_X21;
484 else
485 port->iface = IF_IFACE_V35;
486
487 if (register_hdlc_device(dev)) {
488 printk(KERN_ERR "pc300: unable to register hdlc "
489 "device\n");
490 port->card = NULL;
491 pc300_pci_remove_one(pdev);
492 return -ENOBUFS;
493 }
494 sca_init_sync_port(port); /* Set up SCA memory */
495
496 printk(KERN_INFO "%s: PC300 node %d\n",
497 dev->name, port->phy_node);
498 }
499 return 0;
500 }
501
502
503
504 static struct pci_device_id pc300_pci_tbl[] __devinitdata = {
505 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_1, PCI_ANY_ID,
506 PCI_ANY_ID, 0, 0, 0 },
507 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_2, PCI_ANY_ID,
508 PCI_ANY_ID, 0, 0, 0 },
509 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_1, PCI_ANY_ID,
510 PCI_ANY_ID, 0, 0, 0 },
511 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_2, PCI_ANY_ID,
512 PCI_ANY_ID, 0, 0, 0 },
513 { 0, }
514 };
515
516
517 static struct pci_driver pc300_pci_driver = {
518 .name = "PC300",
519 .id_table = pc300_pci_tbl,
520 .probe = pc300_pci_init_one,
521 .remove = pc300_pci_remove_one,
522 };
523
524
525 static int __init pc300_init_module(void)
526 {
527 #ifdef MODULE
528 printk(KERN_INFO "%s\n", version);
529 #endif
530 if (pci_clock_freq < 1000000 || pci_clock_freq > 80000000) {
531 printk(KERN_ERR "pc300: Invalid PCI clock frequency\n");
532 return -EINVAL;
533 }
534 if (use_crystal_clock != 0 && use_crystal_clock != 1) {
535 printk(KERN_ERR "pc300: Invalid 'use_crystal_clock' value\n");
536 return -EINVAL;
537 }
538
539 CLOCK_BASE = use_crystal_clock ? 24576000 : pci_clock_freq;
540
541 return pci_register_driver(&pc300_pci_driver);
542 }
543
544
545
546 static void __exit pc300_cleanup_module(void)
547 {
548 pci_unregister_driver(&pc300_pci_driver);
549 }
550
551 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
552 MODULE_DESCRIPTION("Cyclades PC300 serial port driver");
553 MODULE_LICENSE("GPL v2");
554 MODULE_DEVICE_TABLE(pci, pc300_pci_tbl);
555 module_param(pci_clock_freq, int, 0444);
556 MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz");
557 module_param(use_crystal_clock, int, 0444);
558 MODULE_PARM_DESC(use_crystal_clock,
559 "Use 24.576 MHz clock instead of PCI clock");
560 module_init(pc300_init_module);
561 module_exit(pc300_cleanup_module);
WRT350N Kernel Patches